Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993nassp.507..583v&link_type=abstract
In NASA, Washington, Cataclysmic Variables and Related Objects p 583-645 (SEE N95-27068 09-89)
Astronomy and Astrophysics
Astronomy
Absorption Spectra, Cataclysmic Variables, Emission Spectra, Light Curve, Stellar Spectra, Stellar Spectrophotometry, Symbiotic Stars, Variability, Balmer Series, Continuums, Cool Stars, Ionization, Radio Observation
Scientific paper
The term Symbiotic stars commonly denotes variable stars whose optical spectra simultaneously present a cool absorption spectrum (typically TiO absorption bands) and emission lines of high ionization energy. This term is now used for the category of variable stars with composite spectrum. The main spectral features of these objects are: (1) the presence of the red continuum typical of a cool star, (2) the rich emission line spectrum, and (3) the UV excess, frequently with the Balmer continuum in emission. In addition to the peculiar spectrum, the very irregular photometric and spectroscopic variability is the major feature of the symbiotic stars. Moreover, the light curve is basic to identify the different phases of activity in a symbiotic star. The physical mechanisms that cause the symbiotic phenomenon and its variety are the focus of this paper. An astronomical phenomenon characterized by a composite stellar spectrum with two apparently conflicting features, and large variability has been observed. Our research set out to find the origin of this behavior and, in particular, to identify and measure the physical mechanism(s) responsible for the observed phenomena.
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